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Former Utah Attorney General Mark Shurtleff has resigned his job with the law firm of Troutman Sanders, saying the grueling schedule was unsustainable.

"I resigned," Shurtleff confirmed Saturday. "Commuting to D.C. and all the [national] speaking was just too hard on me and my family."

The firm's Washington, D.C., office announced it had hired Shurtleff in December, after the Utah attorney general opted not to seek re-election. He testified before Congress on immigration reform in April.

But recently the firm removed his profile and also news releases mentioning Shurtleff from the firm's website, prompting speculation that they had parted ways.

A spokeswoman for Troutman Sanders said the firm does not comment on personnel matters.

Shurtleff has been active in immigration reform efforts around the country.

He has also been facing increasing scrutiny as federal and state investigators have spent months examining his conduct and that of his handpicked successor, Attorney General John Swallow.